Distinguishing nonstandard scalar and fermionic charged particles at a future e plus e- collider

We investigate the possibility to identify the intrinsic spin of exotic charged particles at a future e+e- collider in the l +/- + 2j + ET final state. We choose the inert doublet model (IDM) and minimal supersymmetric standard model (MSSM) as examples for the new physics models with scalar and fermionic exotic charged particles, respectively. The signal arises when these exotic charged particles are pair produced and then decay to a W +/- boson and the lightest neutral stable particle in the new physics model. We choose four benchmarks for the mass parameters which give significant deviation from the dominant standard model (SM) W+W- background. We find that an asymmetry in the cosine of the scattering angle (cos theta) of one of the W bosons reconstructed from jj pair as well as the charged lepton have the potential to identify the MSSM and IDM signal over SM with longitudinally polarized initial beams. A more robust distinction is seen in the shape of the azimuthal angle distribution of the W boson and charged lepton, which can identify and distinguish the IDM signal from MSSM further if the initial beams are transversely polarized.